Weighing scale



FIG. 1 is an isometric view of a weighing scale showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof, a left side elevational view thereof being a mirror image;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a front elevational view thereof.

The matter shown in dashed lines is environmental structure and forms no part of the claimed design. 

The ornamental design for a weighing scale, as shown and described. 